Rock-over molding machine



April 15. 1924. 1,49Q;289

. V e. PICKUP ROCK OVER MOLDING MACHINE Filed March 9. 1922 I 9 5 3:! -'/3 72 7/ 37 v I INVENTOR X I V WE.E.'PIIZZLJP 1% W 6" rah. 4 PirTYs' Patented Apr. 15,1924,

, GEORGE E. PICKUP, OF NEWARK, OHIO, ASSIGNOR TO THE WEI-IRLE COMPANY,

F NEWARK, OHIG A CORPORATION OF OHIO.

nooxovan MOLDING macnrnn.

Application filed March 9, 1922. Serial No. 542,363

To all whom it may concern:

Be it'known that I, GEORGE E. ProKUP, a citizen of the United States, residing at Newark, in the county of Licking and State of 6 Ohio, have invented certain new and useful Improvements in Rock-Over Molding Machines, of which the following is a specification.

The invention relates'to molding machines pecially to machines of this class which are operated by hand power.

The aim of the invention is to produce such a machine which is capable of operation with the utmost ease and facility, and hence is particularly adapted for use in making molds relatively larger than is practicable with hand power machines now upon the market.

With this aim in view, the principal object of the invention specifically stated, is to provide a novel means for supporting the work table, which enables the operator tosiving it with a minimum expenditure of effort from 2 a rearward horizontal position at 'a convenient height from the floor, to a forward inverted position elevated so asto provide ample space between it and the floor for the BlllClBIllL and unrestricted operation ofthe pattern-stripping device. V A further and ancillary object of the inyention is to increase the effectiveness of the counterbalancing means for the table.

Herein, a single embodiment only ofthe invention is illustrated and described, but it will be understood that the invention is not limited to any precise construction and arrangement of the parts, for many changes therein may doubtless be made by those the spirit and scope of the invention as expressed in the appended claims.

In the drawings, Figure 1 is a side eleva- I v V lever and pivotally connected wlth the mem-' tion of my improved machine showing the turntable in its rear or operative position. Fig. 2 is a vertical central sectional view through the machine and. showing the table in its forward inverted position, the intermediate position being shown; in broken lines.-

of the rock-over table type, and more esskilled in the art but without departing from I Fig. 3 is a fragmentary sectional view show ing a detail of construction.

The machine comprises a frame 7 formed from two side members 8 connected at their lower forward ends by a cross frame member or bracket 9 and at their rear ends by upper and lower rods 10 and '11. The latter is extended at its opposite ends to provide journals for the rear supporting wheels 12. I

The forward cross piece 9 is cast to provide' centrally thereof a suitable support for a pivot rod 13 upon which a forward centra supporting wheel 14: is journalled.

Upon opposite sides of the front piece 9 are forwardly projecting portions 9 carrying upright tubular stems 15 in which are guided for vertical movement'a pair of horizontal universally mounted bars 16 forming mold rests, one at each side of the machine.

These bars are pivoted attheir centers to supporting members 17 so as to have a limited rocking movement on their axes 18. To this end the parts are provided with coacting stops 19 and 20. The members 17 are mount ed upon screw-threaded rods 21 in the op-- posite ends of a cross bracket 22 having bearings 23 for this purpose. The bracket 22 in turn is pivotally supported centrally thereof as at 24, to a cross bar 25, having formed integral therewith at each end two itubular members or sleeves 26 slidable upon the stems 15. In Fig. 3 the left end of the bracket 22 is broken away to expose one of the sleeves 26 on the bar 25. Said sleeves 26 are preferably closed at their upper ends so as to form-inverted cup members, and carry centrally depending guide rods 27 which are arranged to operate within the tubular stems lhe supporting bars 16, constituting the mold rest, are lowered to strip the mold from the pattern by means of a U-shaped rod 29 forming at its forward end a foot and. bolts" 33." Rigid with the bars 350 is an arm 34 arranged approximately at right angles thereto and connected at its free end, by means of a spring 35, to the cross rodll. It will be observed that this spring 35 tends to move the mold rest bars 16 upwardly so as to provide yielding supports for; the mold. When the latter has been placed upon this support and the pattern rapped, the mold is stripped from the pattern (the. latter being carried by the table in the well known manner) by a depression of the lever 29.

It will be obvious that inusome instances a substantial amount of movement in a vertical direction must. be imparted to the mold in order to strip it from the pattern. It therefore is desirable that the rock-over table when in its inverted position, as shown in Fig. 2, be elevated to provide ample space between it and the normal position ofthe mold rest.

The rock-over work table is indicated generally at 36. This table is mounted in themframe for swingingmovement from a rearward horizontal position (Fi l) to a forward inverted position (Fig. 2). Preferably it is cast in the form of a rectangular frame having at its free edge a pair of handles 36"* to facilitate its swinging operation.

The means forsupporting the work table is especially constructed and arranged so as to enable the operator to move the same from a rearward normal position to a for ward elevated and inverted position with the utmost ease. This means in the present instance comprises a pivotal support or carrier in the form of a pair of arms or members 37 (Fig. 2) pivoted at 38 in the frame. between the side members 8 thereof and near its forwardupper edge portion. The table is pivoted to the members 37 asat 39 upon anaxis normally spaced a substantial distance rearwardly from the upper inner side edges of the side membore 8 of the frame. The members 37 oocupy such normalhorizontal position while the table is swung from its rearward position approximatelyiinto an upright position when relative movement between the table and the members 37 is limited to accomplishHt-heshifting of the pivotal axis upon. which the table turns fromthe axis 39 to-the axis 38. Such limitation of the -movement of the table relative to the members37. is accomplished in the present instance by rearwardly'extending arms 4C1 rigidzwith thetable and"adapted to enmenses gage with stop lugs ell upon the inner sides of the members 37 opposite the stop lugs 40. Then the arms e1 thus engage the stop lugs a1- the members 37 swing upon their pivotal axis 38 into an upright posi tion while the table moves forwardly and downwardly from an upright position into an inverted elevated position. To limit such downward movement of the table, the members 37 have rigid therewith arms 42 extending in the normal horizontal position of the members downwardly from the axis 38 and these arms 42 are adapted to engage with stop lugs 42 upon the inner sides of the frame member 8 when the members 37 reach an upright position and the table its forward horizontal position.

For the purpose of counterbalancing the weight of the table 36 acting upon the members 37 as the table approaches either extreme limit of its movement. I provide one or more contractile springs -13 connected with the arms 42 of the members 37 and with a cross rod 44. in the lower portion of the frame. Preferably said arms 42 extend slightly forwardly and the arrange ment of the springs is such. that they exert a slight lifting effect upon the table when in its rearward position.

To assist the operation of swinging the table from its normal rearward position into an upright position I provide a pair of contractile springs 45 connected with the arms 41 of the table and with the free ends of a pair of arms 46 which are formed integral with the members '87 and in the normal position thereof extend downwardly and rearwardly at an angle of approximately degrees. These arms 46, it will be observed from Fig. 2, swing upwardly as the table moves forwardly and downwardly. Hence their weight tends to assist the springs 43 in counterbalancing the weigh of the table in its forward swinging n'iovement.

It will be observed that the table swings through an arc of approximately degrees only relative to the members the members 37 swing through an arc of approximately 90 degrees only with respect to the frame. By this arrangement it will be apparent that the amount of expansion of the springs 43 and 4:5 is relatively slight as compared to the common construction in which the arc of travel for the moving end of the spring is 180 degrees.

The table frame 36 when in its rearward or operative position rests upon the frame 7 (Fig. 1). suitable coacting lugs 418 and 49 on the table and frame respectively being provided for this purpose. To insure that the table will be held in this position so long as may be desired, against the action of the counterbalancing springs 43 and 45, I provide a hoolr 51. pivoted. at 52 upon 37: and that incense wardly upon its axis 39 into approximately an upright position as shown in broken lines in Fig. 2. In this operation the rearward extensions 46 of the members 37 remain stationary until the arms 41 of the table frame engage with the stop lugs 41* upon the members 37, whereupon the axis of pivotal movement of the table shifts forwardly from the axis 39 to the axis'38. in the following operation the members 37 swing upwardly and forwardly until their swinging movement is stopped by the engagement of the arms 42 with the lugs 42. Obviously in such forward movement of the table frame 36 the weight of the rearwardly extending arms 42 of the members 37 tends to counterbalance the downward and forward movement of the table, and the counterbalancing efi'ect is augmented by the springs 43.

It may be observed that in this operation, as the axis upon which the table is swinging shifts from the journal 39 to the journal 88, said axis moves with referencelto the weight upon the table so as to follow in the direction of the center of gravity. Consequently. it is possible with my improved machine to turn over the molds of such size and weight as is impossible of accomplishment with machines previously constructed. At the same time, by reason of the ease with which the operation'may be accomplished, a considerable saving in time as well as in the efiort required is ef- V fected. 7

The pattern may be secured to the table frame in any suitableand well known way.

Thus it may be rigid with an auxiliary frame 54- (Fig. 1) secured to the table by means of bolts 55 entered through apertured bosses 56 upon the underside of the table frame. The mold flasks are in vturn secured upon the frame 54 and to the table 36 in any suitable way, not herein shown, since it forms no part of the present invention.

I claim as my invention: i

1. A molding machine havinga supporting frame, a pair of carrier members pivoted to said frame, a table pivoted to said members, means for limiting the extent of relative pivotal movement between the members and the frame on the one hand and the table and the members ontheother hand, and spring means tending. to assist comprising, in combination, a supporting frame, a table, means pivotally mounting the table upon said frame for rocking movement comprising a member pivotally connecting the table and the frame, said table beingswingable on said member from a rearward horizontal position to an upright position and having a limited movement with respect to the member whereby as it swings forwardly from such upright position to an inverted position, the pivotal axis shifts from the member to the frame, and

spring ward movement of the'table.

8. A molding machine having a rockover table, and means for pivotally suppering the table comprising a pair of pivoted members upon which said table is mounted for swinging movement, said members having rearward extensions, and springs connecting such rearward extensions with the table to assist the swinging movement of the table from a normal rearward and horizontal position-to an intermediate upright position.

4. A molding machine having a rockover table, and means for pivotally supporting the table comprising a pair of pivoted members upon which said table is mounted for swinging movement, said members having rearward extensions, springs connecting such rearward extensions with the table to assist the swinging movement of the table from a normal rearward and horizontal position to an intermediate upright position, and springs connected withisaid memmeans tending to resist the downbers to resist the swinging movement of the" table into a forward inverted position.

A molding machine having a rockover work table, a pair of members mounted upon a fixed pivot and pivotallysupporting said table so that it is swingable from normal operative position through" approximately 180 degrees to an inverted pattern stripping position, the arrangement being,

such thatduring a portion. of its movement the. table swings upon its pivotal connection with the members and during the remainder of the movement swings with the members upon the pivotal axis of the latter.

6; A molding machine having a rock-over work table, a member mounted upon a fixed pivot and pivotally supporting said table so that it is swing-able from a normal operative position through approximately 180 degrees to an inverted pattern-stripping position, the arrangement being such that during a portion of its movement the table swings upon its pivotal connection with said member and during the remainder of the movement swings with the member upon the pivotal axis of the latter,.and means carried by said member for counterbalancmg the weight of the table as it swings from its upright position to its inverted position.

7. A: molding machine having a rockover work table,- a carrier member mounted upon afixed pivot and pivotally supporting said table so that it is swingable from a normal operative position through approximately 180 degrees to an inverted patternstripping position, the arrangement being such that during a portion of its movement the table swings upon its pivotal connection with the member and during the remainder of the movement swings with the member upon the pivotal axis of the latter, and spring means acting between said memher and said table so as to counterbalance the latter as it swings from its upright position to its inverted position.

8. A molding machine comprising, in combination, a mold rest, a work table swingable from a rearward substantially horizontal position to a forward elevated but-inverted position so as to position a mold carried thereby onto said mold rest, the means for supporting the table comprising a carrier member normally disposed in a substantially horizontal position and in the forward inverted position of the table oecupying approximately an upright position.

9. A molding machine comprising, in combination, a mold rest, a work table swingable from 'a rearward substantially horizontal position to a forward elevated but inverted position so as to position a mold carried thereby onto said mold rest, the means for supporting the table compris ing a carrier member normally disposed in a substantially horizontal position and in the forward inverted position of the table occupying approximately an upright position, said table being pivoted to said member and having arms rigid therewith and extending beyond the pivotal connection of the table with the member, and springs connecting said table arms with said member whereby to facilitate the operation of moving the table from its rearward horizontal position to its upright position.

10. In a molding machine, a table, means for supporting the table including a member pivoted on a fixed axis and having an arm extending in the normal position of the parts rearwardly from said fixed axis and an arm depending from said axis, said member being swingable through an arc of approximately 90 degrees,and a spring connected with the depending arm and tending in the normal position of the parts to counterbalance the weight of the table and in the swinging movement of the table from an upright position to a forward inverted position to resist the action of gravity.

11. In a molding machine, the combination of a table and a pivotal support for the table swingable with the table through an arc of approximately 90 degrees only, and a spring having a connection with said support such asto resist its movements toard eit e e t m Pos t neeaase 12. In a hand power rock-over table molding machine, the combination of a frame, a table and a pivotal support for the table in the frame, said support being swingable through an arc of approximately 90 degrees only, and a spring acting between the frame and said support tending to counterbalance the movement of the table toward one extreme position.

13. In a hand power rock-over table molding machine, the combination of a frame, a table, and a pivotal support for the table in the frame, said support being swingable through an arc of approximately 90 degrees only, a spring acting between the frame and said support tending to counterbalance the movement of the table toward one extreme position, said table being pivoted to said support, and a spring acting between the support and the table tending to assist the movement ofthe latter from a rearward horizontal position to an upright position.

14. In a molding machine, the combina tion of a frame, a work table, a pivotal support for the table and the frame comprising a member pivoted upon a fixed axis in the frame and providing a pivotal support for the table, said member having a part adapted to engage with the frame to limit its rearward and downward movement in the frame and a second part adapted to engage with the frame to limit the upward and forward movement of the member relative to the frame.

15. A molding machine having a frame, a pair of members pivoted forwardly in the frame and extending normally in a rearward direction, a table pivoted to said members at a point spaced rearwardly from their connection with the frame, and coacting stop lugs on the members and frame serving to limit the extent of relative swinging movement between these parts.

16. A molding machine having a rockover work table having means for securing the pattern thereto and pivotally mounted for swinging movement initially on an axis near one edge thereof and finally on an axis spaced forwardly in the direction of movement of the table whereby to carry the mold from a normal rearward position to a forward inverted positon.

17. A molding machine having a supporting frame comprising a pair of spaced side members, and a work table pivotally supported between said side members near the upper forward ends thereof and swingable first from a rearward horizontal position in which it supports the mold while being made, and then into a forward inverted position in which the pattern is withdrawn, the arrangement being such that the initial portion of the swinging movement takes place onan axis near the forward edge of 7 over work the table, and the final portion of the swinging movement takes place on an axisspaced, forwardly from Zthefirst mentioned 2X19 said means including a member pivoted.

upon said frame, said table being pivoted to said member at a point spacedrearwardly from the first mentioned pivot, and said member in the inverted position of the table occupying an upright position. i

19. A molding machine having a rock table pivotally mounted for swinging movement "initially on an axis near one edge thereof and finally on an axis spaced forwardly in the direction of movement of the table whereby tocarrythe mold from a normal rearward position to aforward inverted position, and spring means for governing said movement of the table.

20. A molding machine having a supporting frame and a work table pivotally supported upon saidframe and swingable first from a rearward horizontal position in which it supports the mold while being made and then into a forward inverted position in which the pattern withdrawn, the arrangement being such that the initial portion of the swinging movement takes place on an axis near the forward edge of the table and the final portion of the swinging movement takes place on an axis spaced forwardly from the first mentioned axis in the direction of the swinging movement.

21. A molding machine having, in combination, a frame, a table, means pivotally supporting the table upon the frame whereby the table in swinging from one operative position to another turns successively on two spaced parallel axes, and separate means for controlling the movement on the respective axes. 7

22. A molding machine having, incombination, a frame, a table, means pivotally supporting the table upon the frame whereby the table in swinging from one operative position to another turns successively on two spaced parallel axes, and spring vmeans for controlling such swinging movement of the table.

28. In a molding machine, the combination of a main supporting structure, a table,

a support movably mounted upon said supporting structure and providing in turn a pivotal mounting for the table, spring means acting between the supporting structure and said support whereby to govern the movements of the latter, and spring means acting between the table and the support whereby to govern the movements 0 the table relative to the support.

2a. In a molding machine, the combina-' tion of a main supportingstructure, a table, a support movably mounted upon said supportingstructu're and providingflin turn a pivotal mounting for the table, means tending to move the table in one direction relative to said support, and means tending to resist the movement of the table together with the support.

, 25. A molding machine having, in combination, a main supporting structure, a table,

means for supporting the table upon the supporting structure for movement from a normal rearward position into a forward inverted position and vice versa, spring 7 means tending to move the table from its rearward position to an intermediate position, and additional spring means tending to resist 'movement or" the table into its forward inverted position, the first mentioned spring means acting between the table and its support and the last mentioned spring means acting between the supporting structure and the table-supporting means.

26. A molding machine having, in combination, a main supporting structure, a work table, means for pivotally supporting the work table upon the supporting structure whereby in the movement of the table from one operative position to another it swings firston one axis and then on another axis, spring means tending'to resist'movement of the table toward either of said operative'positions, andmeans for locking the table in one of said operative positions.

27. A molding machine having a work table swingable on one axis from one open ative position into an intermediate position and upon a second axis from said intermediate position into another operative position, and spring means tending to facilitate the movement of the table into said intermediate osition and to resist the movement of the table intosaid other operative position.

and a pair of supporting members carried 7 i by the opposite ends of said cross bar and mounted for pivotal movement on horizontal axes extending transversely of the machine. 7

29. A molding machine having, in oombination with a table swingable from a norm1 operative position into a forward in saidmembe r to swin'g'on ahorizontal axis. extending longitudinally of the machine and substantially centrally thereof, and a l pair of supporting members carried by the opposite of said cross ear and mount- 10 ed for pivotal movement on horizontal axes extending transversely of the machine, said supportingmembers being mounted for veri'i e :j zen? amen said CE'OSS bar.

In tesmmony whereof, I have hereunto '15 affixed my signature.

GEORGE; E. PICKUP. 

